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#ifndef CODEEDITOR_H
#define CODEEDITOR_H

#include <QPlainTextEdit>
#include <QProcess>
#include <QHBoxLayout>
#include <QObject>
#include <QLabel>
#include <QScrollBar>

class QPaintEvent;
class QResizeEvent;
class QSize;
class QWidget;
class QCompleter;

class LineNumberArea;
class LineNoteArea;
class ErrorList;


class CodeEditor : public QPlainTextEdit {
  Q_OBJECT

public:
  CodeEditor(QWidget *parent = 0);
  void setPath(QString path);
  QString path();
  //line number
  void lineNumberAreaPaintEvent(QPaintEvent *event);
  int lineNumberAreaWidth();
  //auto complete
  void setCompleter(QCompleter *c);
  QCompleter *completer() const;
  //line note
  void lineNoteAreaPaintEvent(QPaintEvent *event);
  //run the exteral process for auto format function
  bool format(ErrorList* errlist);
  void setProjectPath(const QString& path);

protected:
  void resizeEvent(QResizeEvent *event);
  void keyPressEvent(QKeyEvent *e);
  void focusInEvent(QFocusEvent *e);

private slots:
  //line number
  void updateLeftAreaWidth(int newBlockCount);
  void highlightCurrentLine();
  void updateLeftArea(const QRect &, int);
  //auto complete
  void insertCompletion(const QString &completion);

private:
  //run the exteral process with the generated input for autocomplete function
  void updateCompleter();
  LineNumberArea *lineNumberArea;
  LineNoteArea* lineNoteArea;
  QString textUnderCursor() const;
  QString filepath;
  QString projectpath;
  QCompleter *c;

signals:
  void saveRequested();
};


class LineNumberArea : public QWidget {
public:
  LineNumberArea(CodeEditor *editor) : QWidget(editor) {
    codeEditor = editor;
  }

  QSize sizeHint() const {
    return QSize(codeEditor->lineNumberAreaWidth(), 0);
  }

protected:
  void paintEvent(QPaintEvent *event) {
    codeEditor->lineNumberAreaPaintEvent(event);
  }

private:
  CodeEditor *codeEditor;
};

class LineNoteArea : public QWidget {
public:
  LineNoteArea(CodeEditor *editor) : QWidget(editor) {
    codeEditor = editor;
    layout = new QHBoxLayout(this);
    setLayout(layout);
  }

  QSize sizeHint() const {
    return QSize(18, 0);
  }

  void showNote(int line, const QString& note) {
    QPixmap pixmap(":/icon/bug.png");
    QLabel* label = new QLabel(this);
    label->setPixmap(pixmap);
    codeEditor->verticalScrollBar()->value();
    label->move(2, (line - codeEditor->verticalScrollBar()->value())
                * fontMetrics().height());
    label->setToolTip(note);
    label->show();
    children_list.append(label);
  }

  void removeAllNote() {
    while(!children_list.isEmpty()) {
      children_list.takeFirst()->~QLabel();
    }
  }

protected:
  void paintEvent(QPaintEvent *event) {
    codeEditor->lineNoteAreaPaintEvent(event);
  }

private:
  CodeEditor *codeEditor;
  QHBoxLayout* layout;
  QList<QLabel*> children_list;
};

#endif
